Not every idea is worth pursuing. Some are impossible, some too self-indulgent, some overly complex, and some hopelessly time-consuming.
This isn’t to say that you shouldn’t pursue your ideas anyway, but simply that you should be aware of the investment needed to make them succeed.
And, of course, you won’t know which idea will succeed until you try it out. So pick the first, most practical one and give it a whirl.
If it turns out that it wasn’t the right idea, you can try out another one.